No Service

I Droped my iphone 3g and cracked the back case. I have replaced my back case and bezel with an oem replacement parts. The only thing I used out of my original phone is the motherboard and screen now I have "No Service" I have rebooted, Restarted Re-everything. Help!!

Update

I have been through all of the hoops with ATT and Apple. None have worked so far.

Resources

Repairability

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It's time to speak out for your right to repair

We have a chance to guarantee our right to repair electronic
equipment—like smartphones, computers, and even farm equipment. This is a once-in-a-generation
chance to protect local repair jobs—the corner mom-and-pop repair shops that
keep getting squeezed out by manufacturers.

Join the cause and tell your state representative to support Right to Repair. Tell them you believe repair should be fair, affordable, and accessible. Stand up for your right to repair!